optimize is all nop node detect in mem reuse

mindspore/ccsrc/pre_activate/mem_reuse/mem_reuse.cc

@@ -103,6 +103,7 @@ bool MemReuseUtil::InitDynamicWorkspaceKernelRef() {
 bool MemReuseUtil::InitDynamicKernelRef(const KernelGraph *graph) {
   MS_EXCEPTION_IF_NULL(graph);
   graph_ = graph;
+  is_all_nop_node_ = opt::IsAllNopNode(graph);
   if (!InitDynamicOutputKernelRef()) {
     MS_LOG(INFO) << "InitDynamicOutputKernelRef fail";
     return false;
@@ -223,7 +224,6 @@ KernelRefCountPtr MemReuseUtil::GetRef(const AnfNodePtr &node, int output_idx) {
 }
 
 KernelRefCountPtr MemReuseUtil::GetKernelInputRef(const CNodePtr &kernel, size_t input_idx) {
-  auto is_all_nop_node = opt::IsAllNopNode(graph_);
   if (input_idx >= AnfAlgo::GetInputTensorNum(kernel)) {
     MS_LOG(EXCEPTION) << "Input index " << input_idx << " is larger than input number "
                       << AnfAlgo::GetInputTensorNum(kernel);
@@ -231,7 +231,7 @@ KernelRefCountPtr MemReuseUtil::GetKernelInputRef(const CNodePtr &kernel, size_t
   auto input_node = kernel->input(input_idx + 1);
   // Graph may be all nop nodes and not remove nop node, so this can not skip nop node.
   session::KernelWithIndex kernel_input;
-  if (is_all_nop_node) {
+  if (is_all_nop_node_) {
     // The graph does not remove the nop node.
     kernel_input = AnfAlgo::VisitKernelWithReturnType(input_node, 0, false);
   } else {
@@ -265,7 +265,6 @@ void MemReuseUtil::SetKernelDefMap() {
 }
 
 void MemReuseUtil::SetKernelDefInputs() {
-  auto is_all_nop_node = opt::IsAllNopNode(graph_);
   for (const auto &kernel : graph_->execution_order()) {
     MS_EXCEPTION_IF_NULL(kernel);
     auto key = kernel.get();
@@ -282,7 +281,7 @@ void MemReuseUtil::SetKernelDefInputs() {
         auto input_node = AnfAlgo::GetInputNode(kernel, i);
         // Graph may be all nop nodes and not remove nop node, so this can not skip nop node.
         session::KernelWithIndex input;
-        if (is_all_nop_node) {
+        if (is_all_nop_node_) {
           // The graph does not remove the nop node.
           input = AnfAlgo::VisitKernelWithReturnType(input_node, 0, false);
         } else {
@@ -349,11 +348,10 @@ void MemReuseUtil::SetSummaryNodesRefCount() {
 }
 
 void MemReuseUtil::SetGraphOutputRefCount() {
-  auto is_all_nop_node = opt::IsAllNopNode(graph_);
   auto nodes = AnfAlgo::GetAllOutput(graph_->output(), {prim::kPrimTupleGetItem});
   for (const auto &node : nodes) {
     session::KernelWithIndex kernel_input;
-    if (is_all_nop_node) {
+    if (is_all_nop_node_) {
       // The graph does not remove the nop node.
       kernel_input = AnfAlgo::VisitKernelWithReturnType(node, 0, false);
     } else {

mindspore/ccsrc/pre_activate/mem_reuse/mem_reuse.h

@@ -42,7 +42,7 @@ class MemReuseUtil {
   KernelRefCountPtrList total_refs_list_;
   KernelRefCountPtrList total_wk_ref_list_;
   KernelRefs kernel_workspace_refs_;
-  MemReuseUtil() : util_index_(kInitIndex), graph_(nullptr) {}
+  MemReuseUtil() : util_index_(kInitIndex), graph_(nullptr), is_all_nop_node_(false) {}
   ~MemReuseUtil() {
     if (graph_ != nullptr) {
       graph_ = nullptr;
@@ -87,6 +87,7 @@ class MemReuseUtil {
  private:
   int util_index_;
   const KernelGraph *graph_;
+  bool is_all_nop_node_;
   KernelRefCountPtrList ref_list_;
   KernelDefPtrMaps kernel_def_ptr_list_;
   KernelRefCountPtrList last_ref_list_;